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Effect of McRoberts positioning relative to lithotomy position

(A) The patient's legs have been hyperflexed by assistants. The 16 degree rotation for a 10.5-cm obstetric conjugate (ideally) moves the symphisis pubis 9 mm anteriorly and 28 mm in a cephalad direction.
(B) Lithotomy position.

Reproduced with permission from: Poggi SH, Spong CY, Allen AH. Prioritizing posterior arm delivery during severe shoulder dystocia. Obstet Gynecol 2003; 101:1068. Copyright © 2003 American College of Obstetricians and Gynecologists.

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